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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf38788b58714037428dc14b0a0786bf87cf2a89e3ccf17923e61049d6639476' 
  AND token = '2j1EbiRZRr/cj6OOma6I0bMolc5nLzC7mg+Is4u+/ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}