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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4cc0ffe14d46c323f185d921b51c19af61cbc313436484586553edb5430e1db' 
  AND token = 'FhvudZ3ErlcEVPp0rv5FfEThA8PNFR1n7p97K3i7/LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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