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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0906f6606bbf760a36e07ce721229f3f01e8d4249c7df2ced763ae13cd607cc' 
  AND token = 'Yu7h3+b4l4vKWyeJgun+wfeVdrVYooQsfQ+V08+9Tro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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