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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8700bfd06068cbd6a0bb99d3d5f2261f2d88d92f13672459664f38074fe503' 
  AND token = 'sx4B2W/EyvwAMv71qkE+2CLChoXcAZZ5dN61Z9qx+34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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