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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd2cca4e77c4c0c5f9a4da49247273e171c2665710ba35f7ff35456e15bb8f9' 
  AND token = 'DXVbqVzPcQu6LNCX+PfBmCk7gRcr9/5BmsRMxVrV974=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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