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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c8f2310dd522446cde8ebddc2ee29ceaa887056057e41370c6876c8034cbcab' 
  AND token = '2dkZqYnyy6njFLpgK3lC/fHRUP9l8R4praoVwi0qelI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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