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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2ab8b1d4fff835f96aff735340d5a36b9ad1b4eea94fb3888885a7d0b93445' 
  AND token = 'yQ/hyO315KIsW6AXAlx71nswrrmU00Q2+cRMWOrg98s=' 
  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"
    }
  }
}