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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d937c39dc898a62116f7db33ac680951bbf5bf34fcea5b0ecbd599ddd69598' 
  AND token = '1WRwZKpDj5a6tSsEmhD6BPm5e21zum46upy74VSQwD4=' 
  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"
    }
  }
}