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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e427312dcae21be9b7d9a98b49cdcc51ff48382e134b3b7a22d924ef20ca2d' 
  AND token = '9SI2PLaN66dDJr3T21lXks5fV0m5HV7kDETG5JYSwcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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