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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d5140baa37c0665590ddbfc34918fb55efa7fee791702e59ff6d434d48ba45' 
  AND token = 'zf54YRN0Z2Ur/SSIIemUIW2hwP5ZOSiuhnABx5sr5OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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