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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0bfe46ecb5ff0168263547ff8ce2f62362c9961d20f1885f9fd774f5b2f9e6' 
  AND token = 'tmOZa2MhQd5M5Yl3v6agsN6kh/C2U95dI1KYwVkIr/M=' 
  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"
    }
  }
}