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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f919a605e26a11ff16f5ef599f2b45f812a159a56d4f2d95645dd9f8c964ac43' 
  AND token = 'izdhWTSa23gIjHvijDyBFil8EzaonyF8Rg6n9lNY8WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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