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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7fd4e8452cf4c69b995ddb03c97f34ac18e5061965756bb420703a49556079' 
  AND token = 'PqFFdYuvb6bYZjATxosechKKEWyy03WroB7yFrd3f0M=' 
  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"
    }
  }
}