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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b584495af3057602677b28a1d98a33e7544fe25ac3dd4d518abd7d8074a572' 
  AND token = 'VIzfJVvv8bdxY0fECLji/ILV81H4nWzr5QaI96CdVAA=' 
  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"
    }
  }
}