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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e500226fc8e6f8b8c82794ed04fd3de121ba85c17b4299767993da426172ea2a' 
  AND token = 'qDDRNCad96vi9sHhOe1KWff9vnWaF2jgcr/qqBYunA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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