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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd253104ec3708b73d56108c97a3edd38846257a1ee36761d6dc6fa7c5a699f73' 
  AND token = 'wyhht9UmvPCLgLLAOon3S9iSYZqxJz6SCLQrCD6y9BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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