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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e3439960bc4138b46ad3a77c1253da7fa4aaeba5838290efa0e975bcd42ef18' 
  AND token = '8aQO37ya2jJsqIAeu7FrXpiL5g2lba3JZWK/gMlyiK8=' 
  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"
    }
  }
}