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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd0bfd474957dc49a5a8308457cb84216f7784b303438f7e1775d5c6ee68db6' 
  AND token = 'Jh5zDJDH3DsKl34CpOlWTih5JBm4GJd4LtK5dzS7eOc=' 
  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"
    }
  }
}