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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83c88e72cad30c19ed73ccbd7f2b8fa8d28ab325d3ac0fda6ffe4640b2a8597' 
  AND token = 'ceVniAkZsWIkqB0UG9Ybb7LcrtsJrHP+wD2FYEvPIaE=' 
  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"
    }
  }
}