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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0584c848989a151e9e8985d53bdce104098ff1ba6e74a9b30602584eeefea133' 
  AND token = 'FGyFQQWK+Jy8YDG6LtIOQNZttuRYYL4FBvPE/k/0gtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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