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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead905ccf96be8ef5668085f59d84cf96808312b603db2259dc4cc8ab572412a' 
  AND token = 'jmZaxhAOiGd53lRytliarbyX1xWCDvt+bvFRiLv1o8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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