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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a22964f668cb9a47640a651811eb96f15d5721873aa8a389a22402b8743c83c' 
  AND token = '+ECN07vkuo3g3BfEj4g7hRkB2OmslY4nizN9gnfnyNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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