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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db40413d7ba6591c7e23f7a23f2541291d31cae7ad91dbf9dcce77e0d6c2f95a' 
  AND token = '/2CI+yg0u24keWstCeQsbdN2Jj2pgafCYovypDG4ttg=' 
  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"
    }
  }
}