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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b42eb77ac0c3de3ce7bf9e2f35718374f4bb124ad34645d9a6ba2051e9d80ee' 
  AND token = 'A9DMKpQMx4Srr2LcnhC9nwHzAADleA3ozMNJrFB2Csg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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