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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01268b49c7a62ddee69baa85cd538552575d8c4e403a3fe65c2f35a5b4b566b1' 
  AND token = 'KjdFvkbwhv4MwUUNkyNg8ORhvIRvPIhza3EW4/bbxLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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