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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e586bd2a2fbbbb99b81f25f5544cf519c121e7ed86c0b643b79f0120db30cf48' 
  AND token = '5dPInc+i4dOUgZ3CQgt+d0B975cAhQpu9v11kZZpPU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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