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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38057cc9d2487422967674a2e2416986d858e134acb9e469f10301b6165c2a03' 
  AND token = 'essLNA2v3Zz8Y4YIGctFk309DIxjFoiS74XGkZaU7sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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