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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5af4d49cc6afe8846866200e06be4f0050c1af6a5240c740e7f993727192d3a9' 
  AND token = '2cNVAlpZ5ygDBsCyooONI/gwr33W/DK5qR01UvuIuXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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