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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57596e30493cb2749a538dff1523cbd6a7a67b1d6dbcfab5df444aca6114d1c1' 
  AND token = 'N2WK8do3YRQj+4mFxCFCxdmJs9Cje68bxyE5cNfATUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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