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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5abe0d438b54dadac3eb592e69d9374b038048d4d0d8bc1de994145dd1b3ecc3' 
  AND token = 'tZ07SuF3S2kRg4cG/0OoAGiwf33yuzOcUqbGOVprQoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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