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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2234d48ed0d5ae7abc7bffc78b9444a799d41bad1953ae8424f9c7cd0ec5b5c' 
  AND token = 'cZPHvtOpMMD/+/pJ9KocnAQeT+4cOQAH0gv/F13kWsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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