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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8308549536d675802d42a2761c2b2ea5262c258f250b664fb14cd7ecaf990b1d' 
  AND token = 'G2QZbhilkqEUOXValR1OHZgv7oc5Hi9jVUSP2giKLnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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