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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25174c7e23cf57b9d173c2f8a5d06d7cac8dc644c745471a93594aef07e27f07' 
  AND token = 'jWeqmPnOGoYAgTYYnOrm6yOQJCdR5ur2e8RRLNs9AuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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