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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c45d4dcc6f319edfafda28f107e30592761d2e48cd1d821f859a0d81755736a2' 
  AND token = 'oAvyPInb8oWrbz5l+h9UNE94a2fVpv/6x43NH4Keu8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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