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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f1681f8c774ab88c2d3548db000fb4f90366e9101fcaa1c0d0b8cb45ae3014' 
  AND token = 'e8hN712p9+P3I63m8t8v6C6AODFTfO/ZEPdSsxWJDJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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