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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf656dbe8f4ed4d1f4dc6fb241390e75188dc730b4518928a0420914291aef6' 
  AND token = 'Ju9hIBB1rr85Z/l4d5WjyS9hcekey84J8+WsnVLfyRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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