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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26bb9419d96f24c034ca13a06ddf12f424f0727cb1ab89d919fa009a0d0ae5eb' 
  AND token = 'i5i/kJPwYmHjvSkoC2FuemdTzEMFEmkDG7n6o77D2+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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