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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926412f488f4890e6fb864c27f6fa9fc760cb53e0f7efc941abd4afb677eb5a4' 
  AND token = 'p36dO+9MkUz74Mik6n1DRNGx9x+lLo3HsWbWQIRKgDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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