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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99eef73b4f4f25fed4112b67fb4764528ff9eaedfd97753e137bd331fc8eb8b6' 
  AND token = 'qBr9yEZqPP8t7lRsjtW20YcBTHkyNKO4PDLAWL58OiM=' 
  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"
    }
  }
}