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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3021eea1e90723dd0101c266abe43739abd57462aa14f407fc80de72b45a01ee' 
  AND token = '9dokC3SlHucFxHWXUNaa1S86lWlJDIuscTNka8JTe4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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