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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee4973299c3f898d4ce13bb0b4e40d5d0c657bf0d20e8db2c0325480180656f' 
  AND token = 'vdvB3vHR4IoY4Sju95Zk7ZruPLjeM0Q2Gq3+8i+bmtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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