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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9970fa75f74f2d1fe88cac1b6d624276219fc2e0c9e93e1441cd642c3981d640' 
  AND token = '7OkwSj3uWlHp8eaWA7y2gf45XkJtH1Wzq926S7mvdLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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