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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e84d1503b59437dbdcd8bee249111170599881536b4031acc7436a1c9b68a7' 
  AND token = 'Bgpjd4HVS2TKQbZc4MGXXT+fJWm50F2Lbr9asnPSJ7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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