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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e6d62b07beacaa1d2265cb4f25ee0f1afcad3f5572dea3916c9600aeb75a301' 
  AND token = 'tWvloP6QoogbW3m+63k8f7vY7U+QscI1kb3+9Hgb0FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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