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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38408200a42c6b08425c8157d4decc52ec188adbfc58522b6b34b736e5981944' 
  AND token = 'zjV6c16AXtiSKsQQUD439QyeV4yj5i4DIwTV1DeSH4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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