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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d8a362b910bedbd9bd21df14b2bf275923be0400178bfcb2ae8c62d4f4f32f' 
  AND token = '5mMTWRU37T9LGyE6X47533BLEDb4YekFMyOaGoyZ5vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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